SIST ISO 11441:1998 PDF

Name: SIST ISO 11441:1998 — Lead sulfide concentrates -- Determination of lead content -- Back titration of EDTA after precipitation of lead sulfate
SKU: SIST ISO 11441:1998
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Lead sulfide concentrates -- Determination of lead content -- Back titration of EDTA after precipitation of lead sulfate

Название (английский):

SIST ISO 11441:1998

Lead sulfide concentrates -- Determination of lead content -- Back titration of EDTA after precipitation of lead sulfate

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 1 ноября 1998 г.
ICS:: 73.060.99
Технический комитет:: IRUD - Mining

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Описание (английский):

Specifies a lead sulfate precipitation EDTA titrimetric method for the determination of lead content in lead sulfide concentrates. Applicable to all lead sulfide concentrates with lead content in the range from 10 % (m/m) to 80 % (m/m).

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 11441:1995 specifies a titrimetric analytical procedure for the determination of lead content in lead sulfide concentrates. The method is based on precipitation of lead as lead sulfate, dissolution of that precipitate in a known volume of EDTA (disodium ethylenediaminetetraacetic acid) and back‑titration of the excess EDTA with a standardized zinc solution. It applies to concentrates with lead contents from 10 % (m/m) to 80 % (m/m) and includes sample preparation, reagents, apparatus and calculation rules.

Key topics and requirements

Analytical principle: Dissolution by fusion with sodium peroxide → double precipitation of lead as sulfate (with bismuth removal if needed) → dissolve lead sulfate in alkaline EDTA → back titration of excess EDTA with zinc.

Applicable range: Lead content 10–80 % (m/m).

Reagent and safety notes:

Use analytical‑grade reagents and distilled water.
Important reagents include sodium peroxide, sulfuric/perchloric/nitric/hydrofluoric acids, EDTA (0.1 mol·L‑1), and zinc standard solution.
Safety warning for hydrofluoric acid handling (highly hazardous; use fume hood and PPE).

Standardization and blanks:

EDTA is standardized against zinc and lead metal; a blank titration is performed in parallel to check reagent quality.
Calibration factors and repeatability checks are defined; standardization must be repeated if specified ranges are exceeded.

Apparatus and sample handling:

Class A volumetric glassware, nickel/zirconium crucibles for fusion, membrane filters and vacuum filtration apparatus.

Procedure details:

Tabled guidance on EDTA volume by lead content (e.g., ~50 mL EDTA for 10–60 % Pb, ~70 mL EDTA for 60–80 % Pb).
Annexes A and B are integral (sample preparation and acceptance flow‑sheet); Annex C provides precision derivation (informative).

Applications and who uses it

Quality control and assaying of lead sulfide concentrates at exploration, mining, concentrate preparation and smelting stages.

Routine laboratory analysis for metallurgical laboratories, assay offices, smelter QC, and regulatory or certification bodies.

Useful for analytical chemists, metallurgists, QA/QC managers, and providers of certified reference materials.

Related standards

ISO 385‑1 (burettes), ISO 648 (pipettes), ISO 1042 (volumetric flasks), ISO 4787 (volumetric methods), ISO 9599 (hygroscopic moisture in concentrates), ISO Guide 35 (certification of reference materials).

Keywords: ISO 11441:1995, lead sulfide concentrates, lead determination, EDTA titration, back titration, lead sulfate precipitation, titrimetric method, assay, metallurgical laboratory.

SIST ISO 11441:1998 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and who uses it

Related standards

Технические детали

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